People work out for various reasons. Some do it to stay healthy and active, others do it to feel comfortable in their own skin. But working out to stay alive?

What sounds like a fairly strange hypothetical is actually the reality of this ridiculously fit 25-year-old personal trainer from Belfast, Ireland.

When he was just seven hours old, Ben Mudge was diagnosed with an incurable genetic condition known as cystic fibrosis.

The disease mainly affects the lungs and the digestive system, making it hard to breathe and maintain a healthy weight. Patients like Mudge need to take medication to keep their body in working order. Failing to do so can lead to respiratory complications and heart failure.